I set it up on my Engineer and sticking with my other ships name this became the Athos.
The Saucer Separation id figured was just a gimmick like in the show but it really makes the ship play different, in fact it performs on roughly the same level as my Defiant. The main differences is that you lack the ambush cloak and the Big G can turn itself back into a Cruiser when needed (though t is stuck that way for 5 minutes before it can separate again).
In fact I thought in addition to showing off my pretty ship Id show the changes.
U.S.S. Athos
Separated - Escort
Crew 100
Hull 45219
Regen: 240%/Min
Shields: 6582
Regen 344.5/6 sec
Inertia: 55
Speed: 26.3
Turn 13.5 deg/sec
+10 Weapon Power
Together - Cruiser
Crew 1000
Hull 52001
Regen: 240%/Min
Shields: 6911
Regen 381.3/6 sec
Inertia: 25
Speed: 22.31
Turn 3.5 deg/sec
+5 Shield Power
+5 Aux Power
(I do have 2 green and a blue RCS in the thing let over from my efforts to make the Atrox work)
You only have 2 weapons consoles so you wont hit quite as hard but for most uses it will be fine and to my mind in a STF where you dont always need to be tanking things it would be really handy to swap in and out of DPS and Tank modes.
For comparison the U.S.S. toQDuj (Defiant class) (Same gear)
Crew 50
Hull 39001
Regen: 104.5%/Min
Shields: 6220
Regen: 144.5/6 sec
Inertia: 70
Speed: 22.79
Turn 32.0 deg/sec
+10 Weapon Power
In Dark Mirror they describe the Galaxy as almost frowning i can really see it in the first picture of the ship
